Sheet cutting knife



FIG. 1 is a perspective view of the sheet cutting knife of the present design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a right side elevation view thereof; and,

FIG. 5 is a top plan view thereof.

The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a sheet cutting knife, as shown and described. 